Update moves.txt

Fixes a problem with the moves Zap Cannon and Flash Cannon in the German version of PO. They had the same translation, so it was very buggy. 
http://pokemon-online.eu/forums/showthread.php?19315-Flash-Canon-in-German-version
(Fixes this bug, so the thread can marked with fixed of next update).
Merge pull request #361 from turbedi/patch-25

Update moves.txt